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DUI Metrology Dictionary

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Disappearing alcohol

A strange phenomenon whereby some of the ethyl alcohol vapour concentration introduced into the breath tube from a subject or some of the ethyl alcohol vapour concentration introduced into the Intoxilyzer inlet from the wet-bath simulator or dry gas/air gas seems to disappear. The phenomenon is a result of zero for instrument purposes being elevated during prior air blanks.

Making alcohol disappear on an evidentiary breath testing instrument
Ambient Conditions Change Baseline 0 on an IR Breath instrument - Disappearing Alcohol
https://www.duimetrology.com/post/ambient-conditions-change-baseline-0-on-an-ir-breath-instrument-disappearing-alcohol
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Return to list of Words and Phrases in Glossary/DUI Metrology Dictionary

Useful Links at this Site:

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Essential Terminology for a Defence Lawyer to Learn Before Conducting a Cross-examination of an Expert

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Learning to Use the International Vocabulary of Measurement Science Before Conducting a Cross-examination of an Expert

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Essential DUIMetrology Concepts:

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Calibration Interval and Mandatory Periodic Recalibration / Mandatory Periodic Verification

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Traceability of a Measurement Result

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What is Metrology?

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WARNING: Please do not attempt to use any text, image, or video that you see on this site in Court. These comments, images, and videos are NOT EVIDENCE. The Courts will need to hear evidence from a properly qualified expert. The author is not a scientist. The author is not an expert. These pages exist to promote discussion among defence lawyers.

Intoxilyzer®  is a registered trademark of CMI, Inc. The Intoxilyzer® 5000C is an "approved instrument" in Canada.

Breathalyzer® is a registered trademark of Draeger Safety, Inc., Breathalyzer Division. The owner of the trademark is Robert F. Borkenstein and Draeger Safety, Inc. has leased the exclusive rights of use from him. The Breathalyzer® 900 and Breathalyzer® 900A were "approved instruments" in Canada.

Alcotest® is a registered trademark of Draeger Safety, Inc. The Alcotest® 7410 GLC and 6810 are each an "approved screening device" in Canada.

Datamaster®  is a registered trademark of National Patent Analytical Systems, Inc.  The BAC Datamaster® C  is an "approved instrument" in Canada.

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